電話・メッセンジャーアプリはデベロッパの都合で特定人物をブロックしてはいけない。
ブロッキング情報などを別の用途で使ってはならない。トラッキングなど。
原文
2.5.12 Apps using CallKit or including an SMS Fraud Extension should only block phone numbers that are confirmed spam.
Apps that include call-, SMS-, and MMS- blocking functionality or spam identification must clearly identify these features in their marketing text and explain the criteria for their blocked and spam lists.
You may not use the data accessed via these tools for any purpose not directly related to operating or improving your app or extension (e.g. you may not use, share, or sell it for tracking purposes, creating user profiles, etc.).